EVELYN NIEVES and SCOTT SONNER

Associated Press

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That morning, the sky was clear, the wind light. Steve Fossett took off alone from hotel magnate Barron Hilton's Flying M Ranch, about 70 miles southeast of here, in a blue and white stunt plane with orange stripes and blue sunbursts on the wings.

It was supposed to be a short pleasure ride before lunch.

The two-seater was Hilton's, but Fossett could fly anything. He had circumnavigated the globe without refueling, flown around the world in a balloon. Two months earlier, he had been inducted into the National Aviation Hall of Fame.

"I'm hoping you didn't give me this award because you think my career is complete," he said at the time, "because I'm not done."

More than a year after the 63-year-old Fossett vanished during his jaunt, a lingering mystery has been solved, with discovery last week of his plane's wreckage and possible remains in the wilds of California's Sierra Nevada. He had slammed into a mountainside at about 10,000 feet and died instantly. But a larger question remains: What caused such an accomplished aviator to crash in a place he knew well, on a fine September day?

Finding the answer may take many months. On Friday, investigators from the National Transportation Safety Board began hauling debris from the crash site by helicopter. They plan to reassemble the plane at a Sacramento warehouse piece by tiny piece to look for mechanical failures. Gathering archival weather records, including winds, clouds and turbulence for the day of his flight, likewise is not simple, officials said. With luck, radar data will help determine Fossett's path and pinpoint the time of the crash.

For now, speculation runs the gamut. Ralph Obenberger, undersheriff of Mono County, Calif., thinks Fossett may have run into unexpected weather. He remembers large storm clouds over the peaks around Mammoth Lakes on Sept. 3, 2007.

But Bill Manning, the director at Mammoth-Yosemite Airport, said that day was generally clear and calm in the Mammoth Lakes region. He wondered if Fossett ran into other trouble. The high Sierra is always a dangerous and unforgiving area to fly, he said. There's little room for error, he reasoned, for pilots who like to fly low and slow, "yanking and banking" through the region's spectacular granite peaks and canyons.

Joe Sanford, the undersheriff of Lyon County, Nev., had more ideas. "There are so many things that could have gone wrong," he said. "Was it a medical problem? Did the aircraft fail? He had flown that aircraft before but not a whole lot. Did he know the area? The wind shears, the downdrafts? Did he just get into a compromised position where he couldn't get out?"

Sanford had obsessed about Fossett since he disappeared. So had many others. The hunt for the Chicago multimillionaire adventurer who set more than a hundred world records in hot-air balloons, gliders, jets and boats had become an almost mythic quest.

Searching for Fossett cost millions of dollars, occupied crews of dozens for weeks at a time and spanned more than 24,000 square miles. A Nevada state audit called the effort to find Fossett "the largest search-and-rescue effort ever conducted for a person within the U.S."

The first week, the small air force of planes and helicopters scouring the Sierra spotted eight uncharted crash sites, some decades old, suggesting it might also take years to find Fossett's plane. Sanford publicly fretted that it might never be found.

But crews never stopped looking. Just weeks before Fossett's plane was found, 28 searchers spent three weeks trekking through brutal terrain in a Nevada mountain range.

The wreckage of Fossett's plane was found in the Inyo National Forest, about 65 miles from the Flying M Ranch and seven miles from the resort town of Mammoth Lakes. The California Civil Air Patrol had flown over the area 19 times during the initial search, but it had not considered it a likely place to find the plane, given Fossett's type of aircraft, travel plans and fuel.

It took a hiker on a day trip to stumble upon the first clues that would lead to the wreckage, just before another snow season would have buried them until spring. Preston Morrow had hiked from Mammoth Lakes to Devils Postpile National Monument, a grueling 3.5-hour trek, when he decided to step off the trail to hunt for an abandoned mine. Scrambling down loose rocks on a steep mountainside, he saw documents encased in plastic, and 10 loose hundred-dollar bills.

The name on the cards, James Stephen Fossett, meant nothing to him. But the next day, Morrow showed his find to co-workers at a Mammoth Lakes sporting good store and learned what he had found.

Morrow headed back to the site with a small group, including local bear expert Steve Searles, nicknamed "the bear whisperer," and a videographer in town working on a documentary about Searles and gathering material for a project on Fossett.

Hoping to find the wreckage, the group found a black fleece sweat shirt, size XL.

When Sanford, the Lyon County undersheriff, heard about the garment, he was puzzled. He knew by heart what Fossett was wearing his last day: sweat pants, a T-shirt and tennis shoes.

Fossett had left his cellular phone and GPS behind. He didn't bring a parachute, didn't file a flight plan. No one back at the ranch, including his wife, was worried. The plane carried 40 gallons of fuel, more than enough to fly to the Sierra and back.

His plan for that final flight was to find dry lake beds he could use for his next feat: an attempt to break the land speed record in a rocket-propelled car. There also were reports that Fossett may have been traveling the U.S. Highway 395 corridor, which passes by Mammoth Lakes, while looking for abandoned airstrips that he could use for glider flights in the future.

He was last seen flying less than 100 feet above ground, not far from the ranch. That was about two-and-a-half hours after takeoff, less than hour before Fossett's scheduled lunch date with Hilton.